tidy(mm): remove extraneous dependencies in model search

- `config` is unused
- `stats` is created on instantiation
- `logger` uses the app logger

invokeai/backend/model_manager/search.py

@@ -22,15 +22,11 @@ Example usage:
 
 import os
 from dataclasses import dataclass
-from logging import Logger
 from pathlib import Path
 from typing import Callable, Optional, Set, Union
 
-from invokeai.app.services.config import InvokeAIAppConfig
 from invokeai.backend.util.logging import InvokeAILogger
 
-default_logger: Logger = InvokeAILogger.get_logger()
-
 
 @dataclass
 class SearchStats:
@@ -59,12 +55,9 @@ class ModelSearch:
 
     def __init__(
         self,
-        stats: Optional[SearchStats] = None,
-        logger: Optional[Logger] = None,
         on_search_started: Optional[Callable[[Path], None]] = None,
         on_model_found: Optional[Callable[[Path], bool]] = None,
         on_search_completed: Optional[Callable[[Set[Path]], None]] = None,
-        config: Optional[InvokeAIAppConfig] = None,
     ) -> None:
         """Create a new ModelSearch object.
 
@@ -77,13 +70,12 @@ class ModelSearch:
             on_search_completed: callback to be invoked when the search is completed
             config: configuration object
         """
-        self.stats = stats or SearchStats()
-        self.logger = logger or default_logger
+        self.stats = SearchStats()
+        self.logger = InvokeAILogger.get_logger()
         self.on_search_started = on_search_started
         self.on_model_found = on_model_found
         self.on_search_completed = on_search_completed
         self.models_found: set[Path] = set()
-        self.config = config or InvokeAIAppConfig.get_config()
 
     def search_started(self) -> None:
         self.models_found = set()